Combine Sphere Map and Texture

Hi, I am trying to create a texture for the iPhone that blends a sphere map and a base texture (to get textured toon effects)...I am sure I am doing something wrong, but have no idea where to look:

Code (csharp):

1. Shader "Textured Toon" {
2. Properties {
3.    _MainTex ("Base (RGB)", 2D) = "white" {}
4.    _EnvMap ("EnvMap", 2D) = "black" { TexGen SphereMap }
5. }
6. SubShader {
7.    Pass {
8.          Name "ENVMAP"
9.          BindChannels {
10.             Bind "Vertex", vertex
11.             Bind "normal", normal
12.          }
13.       SetTexture[_EnvMap] {
14.          combine texture
15.       }
16.       SetTexture[_MainTex] {
17.          combine texture * previous
18.       }
19.    }
20. }
21. }